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I know when i run rotella in my cummins it smells bad. I can smell it in my cab and in the flumes.I run Delvac in my cumins.

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Yeah, I can vouch for that smell. I used it a couple of times in my '02 CTD. And I will probably use it when I finally fire the motor in the Ramcharger (it has been dormant since 2012 and it does not look to good for 2015). That 440 has a hot Comp hydraulic and I don't need lifter problems.

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I use it all the time, my truck even leaks oil and yet I never noticed any kind of smell